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Epicyclic oscillations of thick relativistic disks
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SYSNO ASEP 0484940 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Epicyclic oscillations of thick relativistic disks Author(s) Horák, Jiří (ASU-R) RID, ORCID
Straub, O. (PL)
Šrámková, E. (CZ)
Goluchová, K. (CZ)
Török, G. (CZ)Source Title Proceedings of RAGtime 17/19: Workshops on black holes and neutron stars. - Opava : Silesian University, 2017 - ISSN 2336-5668 - ISBN 9788075102577 Pages s. 47-59 Number of pages 13 s. Publication form Print - P Action RAGtime /17.-19./ Event date 17.11.2015 - 19.11.2015 VEvent location Opava Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords black hole physics ; accretion disks ; oscillation Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GA17-16287S GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 EID SCOPUS 85041799406 Annotation We study epicyclic oscillations of thick relativistic tori with constant specific angular momentum distribution using the finite element numerical method. We have compared frequencies of the axisymmetric and non-axisymmetric modes with the analytic formulae obtained by Straub and Šrámková (2009) and Fragile et al. (2016). We have found excellent agreement in the case of axisymmetric radial epicyclic modes. In the case of the axisymmetric vertical epicyclic modes and non-axisymmetric modes in general, the analytic approximation agrees with numerical results only for tori of moderate thicknesses. Our analysis also revealed an instability of the thick constant angular momentum tori with respect to the radial epicyclic oscillation. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2018
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